The FN Five-seven, trademarked as the "Five-seveN", is a semi-automatic pistol designed and manufactured by FN Herstal in Belgium. The pistol's name refers to its 5.7-mm (.224 in) bullet diameter, and the name's unusual capitalization style is intended to spell out the manufacturer's initials, FN.
The Five-seven was developed in conjunction with the FN P90 personal defense weapon and 5.7x28mm ammunition. The P90 was introduced in 1990, and the Five-seven was introduced in 1998 as a pistol using the same 5.7x28mm ammunition. As a companion pistol to the P90, the Five-seven shares m...